b = 2, doesn't compile - cannot assign to value: 'b' is a 'let' constant ![]() To declare a return type, Kotlin uses colon (:) notation, Swift arrow (->). Kotlin functions are declared using the ‘fun’ keyword whereas Swift functions are declared using the ‘func’ keyword. Swift supports the 'fileprivate' access level but not the 'protected' access level. Swift keywords like 'weak' and 'unowned' aid in resolving retain cycles, which Kotlin programmes do not have.īoth languages support access levels such as 'public,' 'internal,' and 'private.' The underlying meaning is the same. Part of the reason for keyword differences is that the applications written in the languages use different memory models. For example, 'if', 'else', 'for', 'while', and 'continue' statements work in the same way as they do in other C-like languages. The majority of the keywords are interchangeable and have the same meaning. Some code snippets are incomplete or lack input validation for the sake of simplicity. The article will not, however, explain differences in memory management or between iOS and Android platforms.Īt the time of writing, Swift is in version 5.7 and Kotlin version is 1.7.20. Knowing them allows you to switch to a second language and become a Swifter if you are a Kotliner, and vice versa. This article summarizes the most significant syntax differences between the languages. ![]() If you are an Android or iOS developer, you likely know at least one of these languages. It’s not a surprise, as the giants of the IT industry such as Apple, JetBrains and Google are involved in their development. Both are becoming more and more popular and have almost completely replaced the venerable Java and Objective C in the world of mobile platforms. According to the latest stackoverflow survey Swift and Kotlin are among the most-loved programming languages.
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